David Thweatt, the school superintendent in Harrold, Texas, is seen in 2008. Troubled by school shootings around the country, Thweatt decided to arm school staff. Tony Gutierrez/AP hide caption

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Iowa Gov. Terry Branstad (left), Indiana Gov.-Elect Mike Pence (center) and Virginia Gov. Bob McDonnell, chairman of the Republican Governors Association, participate in a panel discussion during the 2012 RGA Annual Conference on Thursday in Las Vegas. Ronda Churchill/AP hide caption

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American Airlines planes sit on the tarmac at Miami International Airport this month. Reports indicate that American Airlines has canceled somewhere between 2 and 5 percent of flights in recent days, reportedly blaming a surge in pilot sick days and maintenance write-ups by pilots. Joe Raedle/Getty Images hide caption

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Volunteers check in a voter in Palo Pinto, Texas, in November 2008. The state is using a list from the Social Security Administration to purge dead voters from its election rolls. Tom Pennington/Getty Images hide caption

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